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chassis tuning

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chassis tuning Empty chassis tuning

Post  slurm January 21st 2023, 11:22 pm

Looking for advise with chassis. Have a home built jegs kit, strut front end, and four link rear. The car launches ok but was thinking my 60s should be quicker ( 1.40s)  Will try and include a video of a run. Curious if I should lower the rear of the car and reset my IC on my four link for better weight transfer.   429 (030) C6 5500 stall 5.00 gear 14x32.https://youtu.be/LZxq94HB8cY
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Post  DILLIGASDAVE January 27th 2023, 5:15 pm

Looks to me like it dead-hooked, and then needed more at-launch torque to keep the sidewall wadded up longer. Which caused it to snap unwind the sidewall giving it a little hop-skip. Either add more power, or adjust for more wheel-speed/less dead-hook at the initial hit.

What does the 4-link map look like the way the car sits now? Depending on how the housing brackets/chassis brackets are currently mounted (in relation to each other) changing the ride height a given amount might drastically limit your usable IC options. You won't know for sure until you map the 4-link.
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Post  Curt January 28th 2023, 5:21 pm

How does it scale?
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Post  slurm January 29th 2023, 12:51 pm

635 lf 709 rf 733 lr and 544 rr. driver in car and fuel. spread on four bars is 10.5 to 6.5. The ic point i can measure is 9.5 above the track surface and 2 inch below the neutral line 50 inches from rear axle center line. I have not tune the carb or set timing above 32 degree yet, spend time working out launch on car. Big question, leave it alone or lower. I do have a 514 and 532 that i am assembling now however was hoping to get chassis good before installing one, both are aluminum rod engine and do not want to test suspension with those. https://youtu.be/BA1pzymCY9A
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Post  pmrphil Yesterday at 9:52 am

Where do you have the shocks set? In slo-mo the wheel seems to be moving up and down quite a bit more than it should.

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Post  slurm Yesterday at 10:19 pm

qa1 double adj compression 2 clicks from softest rebound 10 clicks from softest . Qa1 springs 95 pound. I have 120 springs that I have not tried yet.
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Post  stanger68 Today at 1:26 am

Something i learned from an old guy at the track was to push down on the back of the car real hard to simulate the launch. Then count how many seconds it takes to decompress the shocks. You want a smooth and somewhat slow rise. It looks like in the video your rebound is too loose. It’s bouncing up instead of holding down. I’d have to check my book to be sure but I think your settings are the same as mine and it works good. But mine is ladder bars.

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